3v4l.org

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<?php function hyphenate($str) { return implode("-", str_split($str, 3)); } echo hyphenate("AB");
Output for 7.3.0 - 7.3.29, 7.4.0 - 7.4.21, 8.0.0 - 8.0.8
AB

preferences:
104.03 ms | 459 KiB | 5 Q